0001437749-23-012157 4 1 20230131 20230502 20230502 Nelson Andrew C 0001611476 4 34 001-36522 23880780 3235 MCCONNELL DRIVE BATON ROUGE LA 70809 Investar Holding Corp 0001602658 6022 271560715 LA 1231 10500 COURSEY BLVD THIRD FLOOR BATON ROUGE LA 70816 225-227-2222 10500 COURSEY BLVD THIRD FLOOR BATON ROUGE LA 70816 4 1 rdgdoc.xml NELSON FORM 4 X0407 4 2023-01-31 0001602658 Investar Holding Corp ISTR 0001611476 Nelson Andrew C C/O INVESTAR HOLDING CORPORATION 10500 COURSEY BLVD. BATON ROUGE LA 70816 1 0 Common Stock 2023-01-31 4 L 0 267 20.83 A 133627 D Common Stock 2023-01-31 4 L 0 37 20.83 A 8230 I By AJ Investment Co LLC Common Stock 2023-04-28 4 L 0 405 13.75 A 134032 D Common Stock 2023-04-28 4 L 0 56 13.75 A 8286 I By AJ Investment Co LLC Reflects shares acquired by the Reporting Person under an automatic dividend reinvestment plan. Reporting of this acquisition was deferred under Rule 16a-6(a); however, because of the Reporting Person's purchase of shares on April 28, 2023, the reporting of the acquisition is no longer deferred and is being reported on this Form 4 in accordance with Rule 16a-6(b). As of April 28, 2023, common stock purchases for the Reporting Person through an automatic dividend reinvestment plan have exceeded the aggregated small acquisition market value of $10,000, as set forth in Rule 16a-6, and are therefore being reported prior to a Form 5 filing. /s/ Andrew C. Nelson, M.D 2023-05-02